A tiny crustose lichen, characteristic by clustered apothecia and three-septate ascospores in the shape of a cube with rounded edges. It is an epiphytic species that prefers well-lit, sufficiently humid habitats. It is linked to nutrient-rich mossy bark of deciduous trees, such as maple or ash trees. Collema occultatum was noted four times in the first half of the 20th century in the Czech Republic and then again in 1997 in the Šumava Mountains at the base of a Acer platanoides trunk below the Stožecká skála rock (Palice 1999). Recently, the species has been found in the Křivoklát region at a mossy base of Fraxinus. It is a species sensitive to substrate acidification, rare in entire Europe.
Literature: Pišút I. (1968): Lichenologische Bemerkungen 3. – Annotationes zoologicae et botanicae 50: 1–6.taxonomic classification: most frequented synonyms:Collema occultatum
All records: 3, confirmed 3. One click on a selected square displays particular record(s), including their source(s).